<template>
    <div class="upload-file">
      <el-upload
        multiple
        :action="uploadFileUrl"
        :before-upload="handleBeforeUpload"
        :file-list="fileList"
        :limit="1"
        :handleExceed="handleExceed"
        :on-error="handleUploadError"
        :on-success="handleUploadSuccess"
        :show-file-list="false"
        :headers="headers"
        class="upload-file-uploader"
        ref="fileUpload"
      >
        <!-- 上传按钮 -->
        <el-button type="primary" >导入</el-button>
      </el-upload>
    </div>
  </template>
  
  <script setup>
  import { getToken } from "@/utils/auth";
  
  const props = defineProps({
    modelValue: [String, Object, Array],
    // 数量限制
    
    // 大小限制(MB)
    fileSize: {
      type: Number,
      default: 5,
    },
    // 文件类型, 例如['png', 'jpg', 'jpeg']
    fileType: {
      type: Array,
      default: () => ["doc", "xls","xlsx", "ppt", "txt", "pdf"],
    },
    // 是否显示提示
    isShowTip: {
      type: Boolean,
      default: true
    }
  });
  
  const { proxy } = getCurrentInstance();
  const emit = defineEmits();
  const number = ref(0);
  const uploadList = ref([]);
  const baseUrl = import.meta.env.VITE_APP_BASE_API;
  const uploadFileUrl = ref(import.meta.env.VITE_APP_BASE_API + "/api/common/uploadfile"); // 上传文件服务器地址
  const headers = ref({ token: getToken() });
  const fileList = ref([]);
  const showTip = computed(
    () => props.isShowTip && (props.fileType || props.fileSize)
  );
  
  watch(() => props.modelValue, val => {
    if (val) {
      let temp = 1;
      // 首先将值转为数组
      const list = Array.isArray(val) ? val : props.modelValue.split(',');
      // 然后将数组转为对象数组
      fileList.value = list
    } else {
      fileList.value = [];
      return [];
    }
  },{ deep: true, immediate: true });
  
  // 上传前校检格式和大小
  function handleBeforeUpload(file) {
    // console.log(file)
    // 校检文件类型
    if (props.fileType.length) {
      const fileName = file.name.split('.');
      const fileExt = fileName[fileName.length - 1];
      const isTypeOk = props.fileType.indexOf(fileExt) >= 0;
      if (!isTypeOk) {
        proxy.$modal.msgError(`文件格式不正确, 请上传${props.fileType.join("/")}格式文件!`);
        return false;
      }
    }
    // 校检文件大小
    if (props.fileSize) {
      const isLt = file.size / 1024 / 1024 < props.fileSize;
      if (!isLt) {
        proxy.$modal.msgError(`上传文件大小不能超过 ${props.fileSize} MB!`);
        return false;
      }
    }
    proxy.$modal.loading("正在上传文件，请稍候...");
    number.value++;
    return true;
  }
  
  // 上传失败
  function handleUploadError(err) {
    proxy.$modal.msgError("上传文件失败");
  }
function handleExceed(value) {
    // console.log(value)
}
  
  // 上传成功回调
  function handleUploadSuccess(res, file) {
    if (res.code === '000') {
      uploadList.value.push({ name: res.data.filename, url: res.data.path });
      uploadedSuccessfully();
      handleDelete()
    } else {
      number.value--;
      proxy.$modal.closeLoading();
      proxy.$modal.msgError(res.msg);
      proxy.$refs.fileUpload.handleRemove(file);
      uploadedSuccessfully();
    }
  }
  
  // 删除文件
  function handleDelete(index) {
    fileList.value.splice(index, 1);
    // emit("update:modelValue", fileList.value);
  }
  
  // 上传结束处理
  function uploadedSuccessfully() {
    if (number.value > 0 && uploadList.value.length === number.value) {
      fileList.value = fileList.value.filter(f => f.url !== undefined).concat(uploadList.value);
      uploadList.value = [];
      number.value = 0;
      emit("update:modelValue", fileList.value);
      proxy.$modal.closeLoading();
    }
  }
  
  // 获取文件名称
  function getFileName(name) {
    if (name.lastIndexOf("/") > -1) {
      return name.slice(name.lastIndexOf("/") + 1);
    } else {
      return "";
    }
  }
  </script>
  
  <style scoped lang="scss">
  .upload-file-uploader {
    margin-bottom: 5px;
  }
  .upload-file-list .el-upload-list__item {
    border: 1px solid #e4e7ed;
    line-height: 2;
    margin-bottom: 10px;
    position: relative;
  }
  .upload-file-list .ele-upload-list__item-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: inherit;
  }
  .ele-upload-list__item-content-action .el-link {
    margin-right: 10px;
  }
  .el-icon-document{
    width: 300px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }
  .el-upload-list__item-content{
    display: flex;
    justify-content: space-between;
    align-items: center;
  }
  :deep.upload-file{
    width: 100%;
  }
  </style>
  